I don't think distortion at the edge of the screen has to do with tuning in the hardware, but a matter of how software converts sensor data into a point locatio

I don't think distortion at the edge of the screen has to do with tuning in the hardware, but a matter of how software converts sensor data into a point location. When not at the edge, the finger touch area is typically a circle, so it is fairly easy to interpret the location as the center of the circle. The finger shape at the edge is harder to interpret. I guess is that Nexus One's capacitive sensors is larger than the display screen, that's why the edge performance is so good.